In Chapter Sixteen of Philosopher’s Stone Hermione is supposed to pretend to be waiting for Flitwick to discuss her exam:
"It's obvious," said Ron. "You can pretend to be waiting for Professor Flitwick, you know." He put on a high voice, "'Oh Professor Flitwick, I'm so worried, I think I got question fourteen b wrong....'"
Yet after she leaves the staff room (without talking to Flitwick) she tells Harry and Ron that she already got her score from Flitwick:
"Not if I can help it," said Hermione grimly. "Flitwick told me in secret that I got a hundred and twelve percent on his exam. They're not throwing me out after that."
If she already knew that she got 112% why would she be worried about getting question 14 b wrong? I know that she was only supposed to pretend to be worried, but how would that act be believable when Flitwick would just say that they had already discussed her exam?